Quick Answer
The answer is to contain the affected system. Immediately after detecting a ransomware infection, the first action must be containment to stop the malware from spreading laterally across the network, as ransomware often attempts to encrypt shared drives and connected systems. This step aligns with the NIST SP 800-61 incident response framework, where containment follows detection and analysis to limit damage and preserve forensic evidence. On the ISC2 Certified in Cybersecurity CC exam, this tests your understanding of the incident response phases, specifically that containment precedes eradication and recovery. A common trap is choosing “disconnect the network” or “run antivirus,” but the correct priority is isolating the single compromised host. Remember the mnemonic “DICE”: Detection, Isolation, Containment, Eradication—isolation is the very first physical action, but containment is the official phase name.
This CC practice question tests your understanding of business continuity, dr & incident response. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization discovers a ransomware infection on a critical server. According to the incident response phases, what should be the first action after detection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Notify law enforcement
Why wrong: Notification may be necessary but is not the immediate first action; containment is critical.
Eradicate the malware from the server
Why wrong: Eradication should follow containment to avoid spreading during cleanup.
Restore from backup
Why wrong: Recovery comes after containment and eradication.
Contain the affected system
Containment stops the incident from spreading, which is the immediate priority.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Contain the affected system
Immediately after detection, the priority is to contain the ransomware to prevent it from spreading laterally to other systems. According to NIST SP 800-61 and standard incident response frameworks, containment is the first step after detection and analysis, as it limits damage and preserves evidence for forensic investigation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Notify law enforcement
Why it's wrong here
Notification may be necessary but is not the immediate first action; containment is critical.
Eradicate the malware from the server
Why it's wrong here
Eradication should follow containment to avoid spreading during cleanup.
Restore from backup
Why it's wrong here
Recovery comes after containment and eradication.
Contain the affected system
Why this is correct
Containment stops the incident from spreading, which is the immediate priority.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse the urgency of recovery actions (like restoring from backup) with the correct incident response sequence, forgetting that containment must always come first to stop the spread and preserve forensic evidence.
Detailed technical explanation
Containment often involves isolating the affected server by disconnecting its network interface (e.g., using `ifconfig down` or disabling the switch port via SNMP or CLI) and, if necessary, powering it down to halt encryption processes. In a real-world scenario, failing to contain first allowed the NotPetya ransomware to spread across Maersk's global network, causing over $300 million in damages, because the initial response focused on eradication rather than isolation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
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FAQ
Business Continuity, DR & Incident Response — This question tests Business Continuity, DR & Incident Response — Read the scenario before looking for a memorised answer..
The correct answer is: Contain the affected system — Immediately after detection, the priority is to contain the ransomware to prevent it from spreading laterally to other systems. According to NIST SP 800-61 and standard incident response frameworks, containment is the first step after detection and analysis, as it limits damage and preserves evidence for forensic investigation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.
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